Metal stamping and drawing press



Mar. 3, 1925.

A. A- BYERLEIN' IETAL STAMPING AND DRAWING PRESS 3 Sheets-Shoot 1 Filed May 10. 1920 Mar. 3,1925. 1,527,968.

' A. A. BYERLEIN IE'I'AL STAMPING AND DRAWING PRESS Filed Hay 10. 1920 .3 sums-sum; 2

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' A. A. BYERLEIN I METAL STAIPIN G ANDYDRAII NG PRESS Filed my 10. 1920 a summ; a

Patented Mar.. 3, 1925.

UNITED STATES PATENT OFFICE.

ARTHUR BYEBLEIN, OEF TOLEDO, OHIO, ASSIGNOR TO THE TOLEDO MACHINE &

TOOL COMPANY, OF TOLEDO, OHIO, A CORPORATION OF OHIO.

METAL STAMPING AND DRAWING PRESS.

Application filed May 10, 1920. Serial No. 380,106.

To all whom it may concern.-

Be it known that I, ARTHUR A. BrEnLEIN, a citizen of the United States, residing at Toledo, in the county of Lucas and State of Ohio, have invented a certain new and useful Improvement in Metal Stamping and Drawing Presses, of which the following is a full, clear, and exact description.

This invention relates to metal drawing presses of the type having a metal deforming or shaping plunger which operates'inside a work-holder adapted to hold the work during the shaping operation, and it relates especially to an improved operating mechanism for the work-holder.

The invention in certain of its aspects is an improvement over the construction disclosed in 'the'application filed in the name of Henry J. I-Iinde, Serial No. 371,269, filed April 16, 1920, and over the construction disclosed in my prior application Serial No. 376,217, filed April 24, 1920.

The principal object of the present invention is to provide a simple but efiicient work-holder operating mechanism which imparts the desired movement to the workholder and which eliminates long rockshafts and other parts which are subjected to twisting or torsional stresses and which also does away with the necessity for slides which heretofore have generally been provided at one 01' both ends of the frame to transmit movement to parts provided at the top of the machine to actuate the workholder. In the latter respect the invention is an improvement on the construction shown in the two prior applications above referred to.

The invention is preferably applied to a machine having twin driving gears on the ends of the plunger operating crank-shaft and in carrying out the principal features of the invention I above the crank-sha t and work-holder two similar or duplicate work-holder operating mechanisms which are operated separately but in unison direct from the twin gears through connecting rods connected to offcenter points of the gears.

The invention may be further briefly summarized as consisting in certain novel details of construction and combinations and arrangements of described in the s eci cation and set forth in the appended c ims.

rovide on the frame..

arts which will be In the accompanying sheets of drawings wherein I have shown the preferred and a slight modification of the invention, Fig. 1 is a side view of the machine equipped with my invention in its preferred form; Fig. 2 is an end view of the same with a part of one of the twin driving gears broken away; Fig. 3 is a. top plan view of the frame arch and showing the parts of the work-holder operating mechanisms and their location, and the manner in which they are supported in the arch; Fig. 4 is a view showingthe principal parts of one of the duplicate sets of work-holder operating mechanisms detached from the frame of the machine; Fig. 5 is a view looking toward the left of the mechanism of Fig. 4; Fig. 6 is a view of one of the upper corners of the frame showing a slight modification; and Fig. 7 is a view similar to Fig. 5, showing the operating mechanism of Fig. 6.

Referring now to the drawings, 10 repre- I sents the frame of the press provided at the bottom with a support 11 for a matrix which is not shown. At the top of the press is a plunger operating crank-shaft 12 provided with cranks 13 which are connected by links or connecting rods 14 to the work deforming or shaping phmger not shown. The plunger is surrounded and guided by a work-holder '15 which is guided in ways on the sides 10 of the frame 10 and is actuated by mechanism constituting the subject matter of the present invention.

The crank-shaft 12 is journaled in bearings mounted in the sides 10 of the frame, and in this instance intermediate bearings 16 are also provided which support the shaft just inside the cranks 13 as shown in power is transmitted from the crank-shaft as well as close to the points at which power is applied to the crank-shaft to drive it. This last desirable feature isobtained by reason of the fact that the crank-shaft is provided at its ends with twin driving gears 17 which are close up to the ends of the frame, power being transmitted uniformly to these gears by pinions 18 (see Fig. 2) on a shaft 19 suitably supported on the frame of the machine, this shaft in turn being driven through gears not shownby a shaft 20 to which power may be applied in any desired manner, the shaft in this instance being provided with a pulley and fly-wheel 21.

Taking up next the work-holder operating mechanism in which the present invention resides, it will be observed that the work holder is driven. uniformly from both ends of the machine by separate duplicate mechanisms, the corresponding parts of which operate in unison or synchronism. These two mechanisms are operated direct from the twin gears 17 by connecting rods 22 which at their lower endsare connected by universal joints 23 to off-center points on the outer sides of the gears. These connecting rods extend upwardly along the outer sides of the gears, and at their upper ends are connected by universal joints 24 to outwardly projecting arms of two similarly;

disposed bell-cranks '25, mounted on transverse pins or studs 26 at the two upper corners of the frame, and on the center plane of the top thereof, as clearly shown in Fig. 3. It will be observed that by reason of the universal joint connections between the lower ends of the connecting rods and the crankpins of the gears, and similar connections between the upper ends of the connecting rods and the bell-cranks, these bell-cranks can be rocked freely, as the gears are rotated, in a plane parallel to the axis of the crankshaft, and in' fact, the axis of the crankshaft lies in the lane of movement of these bell-cranks. Bot arms of each bell-crank 25 are forked and the inner forked arms are connected by links 27 to arms 28, which like the bellcranks are located on the longitudinal center line of the arch 10 of the frame,

'these arms 28 being mounted to turn on pins or studs 29 passing transversely through the arch. These arms 28 which are forked, are connected by links. 30 to forked arms 31 keyed or otherwise secured to the center of two shafts 32 extending transversely through the arch andmounted to turn therein. The parts of each operating mechanism so far described, including the bell-crank 25, link 27, arm 28, link 30 and arm 31 are all located inside the arch and centrally with respect thereto. The ends of the two shafts 32 project outwardly beyond both sides of the arch and keyed or otherwise secured to the outer ends of these shafts are crankarms 33. These four arms, two of which are on one side'of the frame and two onthe other, are connected to the outer four corners of the work-holder by links or"connect ing rods 34, the arms 33 and links 34 constituting in effect toggle arms.

- In Fig. 1 the work-holder is in its lowermost-or work-holding position, and when in this position several pairs of connected parts of each work -hol er operating mechanism are on a dead cen as a result of which the work-holder will have a well or will be held stationary in its lowermost position for the desired part ofthe revolution. of the crank-shaft.

' Not only does the work-holder operating ting mechanism is rovided since the workholder operating s ides and all long rockshafts are avoided.

In Figs. 6 and 7 I have shown a slight modification of the invention, it being understood that the mechanism shown atone corner of the frame in Fig. 6 will be: dupli} cated at the other corner. In this instance the bell-cranks 25 are similar in location; 's-

construction and manner of operation to the bell-cranks 25 of the first construction. The

bell-crank 25 is connected by a link 27 similar to the link 27 of the first construction to an arm 36 which corresponds to the arm 28 of the first construction, but in this instance the arm 26 is keyed or otherwise secured to the center of the shaft 37 journaled in the frame and extending transversely thereof. The ends of this shaft project slightly beyond the sides of the frame, and keyed or otherwise secured to the ends of this shaft are crank-arms 38 which are connected by links 39 to bell-cranks 4O supported on opposite sides of the frame on stationary studs, or on a single stud extending across the frame. These bell-cranks will be connected to the work-holder bylinks precisely similar to the links 34 of the first v construction.

It will be seen that the modified construc tion is similar in rinciple to the construction first describe though the parts 38, 39 and 40 are on the outer sides of the arch of the frame, whereas in the first described construction only the cranks 33 are on the prising two pairs of rocker arms, the arms" of each pair. being supported at opposite sides of the frame and the said pairs of arms being adjacent opposite ends of the frame and connected to the work-holder, a pair of rocker arms supported one adjacent each end of the upper part of the frame and cen-' trally with respect thereto and each operatively connected to a air of the firstnamed arms, and means or operating said second mentioned arms from the crank shaft claim;

comprising connecting rods located exte-x riorly' of the frame beyond both ends thereof and connected to points off-center with respect to the axis of the crank-shaftand at their upper ends connected to the said second-mentioned arms.'

2. In a press of the type having a plunger and a work-holder, a crank-shaft for operating the plunger and provided at its ends with twin driving gears, work-holder operating means comprising two pairs of arms, the arms of each pair-being supported on the opposite sides of the frame, one pair adjacent one end and the other pair adjacent the other end, a pair of transmitting arms supported near the top of the frame at the center plane thereof, one adjacent one end of the frame and the other adjacent the other, end, said transmitting arms each being connected to one pair of the first-mentioned arms, and connecting rods at opposite ends of the machine each connecting one of said driving gears on the crank-shaft to one of the said transmitting arms.

3. A press having a supporting frame, a crank shaft extending through the frame centrally thereof and having driving gears fixed to its ends upon opposite sides of the frame, a plunger and a work holder, both movable vertically in the frame below the crank shaft, the plunger being operatively connected to the crank shaft, and means for operating the work holder from the crank shaft comprising a pair of rocker arms mounted upon the frame centrally thereof above the crank shaft, each arm being adjacent a driving gear and having a part extending over the top of the gear and projecting beyond the outer'face thereof, frontand rear toggles suspending the work holder from the frame adjacent each side thereof, connecting rods connecting the rocker arm to eccentric points on the outer sides of the gears, and means for operatively connecting said toggles to said centrally disposed rocker arms.

'bers adjacent each gear, a rocker arm on each of said shafts each rocker arm having a part projecting beyond the outer face of the adjacent gear, connecting rods connecting each rocker arm to an off center point on the adjacent gear, and means for operatively connecting said toggles to said centrally disposed rocker arms.

5. A press comprising a supporting frame, a crank shaft extending through the .frame centrally thereof and having driving gears fixed "to its ends on opposite sides of the frame, a plunger suspended from the crank shaft, awork holder associated with the plunger, 'a pair of shafts extending through the frame above the crank shaft and transversely thereof, downwardly extending arms fixed to opposite ends of said shafts, links connecting said arms to the work holder, an upwardly extending arm fixed to each of said shafts intermediate the ends thereof, toggles connecting said last' mentioned arms to the frame, a centrally disposed rocker arm pivoted to the frame adjacent each driving gear and having a part projecting beyond the outer face of the gear, a connecting rod connecting each rocker arm to an eccentric point on the adjacent gear, and a link connecting each roekerarm to a toggle.

In testimony whereof, I hereunto aflix my signature.

ARTHUR A. BYERLEIN. 

